This Trend CraftPro drill bit guide set provides accurate, self-centred pilot hole drilling for hinges or lock faceplates. It contains 2.4mm, 2.8mm and 3.6mm bits suitable for No.6, No.8 and No.10 screw sizes. These HSS drill bits are made for durability and longevity, with quick-release 1/4" hex shanks for easy use in quick tool change drills and impact drivers. They are spring-loaded to ensure the bit retracts safely and can be easily dismantled for cleaning and drill bit replacement. Suitable for use on a range of materials including timber, ply, MDF and chipboard. The set ensures screws are set correctly for a professional finish, preventing screws from binding or sticking up.